<template>
    <div :id="containerId" style="position: relative">

        <!--  ---------------------------- begin 图片左右换位置 ------------------------------------- -->
        <div class="movety-container" :style="{top:top+'px',left:left+'px',display:moveDisplay}" style="padding:0 8px;position: absolute;z-index: 91;height: 32px;width: 104px;text-align: center;">
            <div :id="containerId+'-mover'" :class="showMoverTask?'uploadty-mover-mask':'movety-opt'" style="margin-top: 12px">
                <a @click="moveLast" style="margin: 0 5px;"><a-icon type="arrow-left" style="color: #fff;font-size: 16px"/></a>
                <a @click="moveNext" style="margin: 0 5px;"><a-icon type="arrow-right" style="color: #fff;font-size: 16px"/></a>
            </div>
        </div>
        <!--  ---------------------------- end 图片左右换位置 ------------------------------------- -->

        <a-upload
                name="file"
                :multiple="true"
                :action="uploadAction"
                :headers="headers"
                :data="{'biz':bizPath}"
                :fileList="fileList"
                :beforeUpload="beforeUpload"
                @change="handleChange"
                :disabled="disabled"
                :returnUrl="returnUrl"
                :listType="complistType"
                @preview="handlePreview"
                :class="{'uploadty-disabled':disabled}">
            <template>
                <div v-if="isImageComp">
                    <a-icon type="plus" />
                    <div class="ant-upload-text">{{ text }}</div>
                </div>
                <a-button v-else-if="buttonVisible">
                    <a-icon type="upload" />{{ text }}
                </a-button>
            </template>
        </a-upload>
        <a-modal :visible="previewVisible" :footer="null" @cancel="handleCancel">
            <img alt="example" style="width: 100%" :src="previewImage" />
        </a-modal>
    </div>
</template>

<script>

import Vue from 'vue'
import { ACCESS_TOKEN } from "@/store/mutation-types"
import { getFileAccessHttpUrl } from '@/api/manage';

const FILE_TYPE_ALL = "all"
const FILE_TYPE_IMG = "image"
const FILE_TYPE_TXT = "file"
const uidGenerator = () => {
  return '-' + parseInt(Math.random() * 10000 + 1, 10);
}
const getFileName = (path) => {
  if (path.lastIndexOf("\\") >= 0) {
    let reg = new RegExp("\\\\", "g");
    path = path.replace(reg, "/");
  }
  return path.substring(path.lastIndexOf("/") + 1);
}
export default {
  name: 'JUpload',
  data() {
    return {
      uploadAction: window._CONFIG['domianURL'] + "/sys/common/upload",
      headers: {},
      fileList: [],
      newFileList: [],
      uploadGoOn: true,
      previewVisible: false,
      //---------------------------- begin 图片左右换位置 -------------------------------------
      previewImage: '',
      containerId: '',
      top: '',
      left: '',
      moveDisplay: 'none',
      showMoverTask: false,
      moverHold: false,
      currentImg: ''
      //---------------------------- end 图片左右换位置 -------------------------------------
    }
  },
  props: {
    text: {
      type: String,
      required: false,
      default: "点击上传"
    },
    fileType: {
      type: String,
      required: false,
      default: FILE_TYPE_ALL
    },
    /*这个属性用于控制文件上传的业务路径*/
    bizPath: {
      type: String,
      required: false,
      default: "temp"
    },
    value: {
      type: [String, Array],
      required: false
    },
    // update-begin- --- author:wangshuai ------ date:20190929 ---- for:Jupload组件增加是否能够点击
    disabled: {
      type: Boolean,
      required: false,
      default: false
    },
    // update-end- --- author:wangshuai ------ date:20190929 ---- for:Jupload组件增加是否能够点击
    //此属性被废弃了
    triggerChange: {
      type: Boolean,
      required: false,
      default: false
    },
    /**
       * update -- author:lvdandan -- date:20190219 -- for:Jupload组件增加是否返回url，
       * true：仅返回url
       * false：返回fileName filePath fileSize
       */
    returnUrl: {
      type: Boolean,
      required: false,
      default: true
    },
    number: {
      type: Number,
      required: false,
      default: 0
    },
    buttonVisible: {
      type: Boolean,
      required: false,
      default: true
    }
  },
  watch: {
    value: {
      immediate: true,
      handler() {
        let val = this.value
        if (val instanceof Array) {
          if (this.returnUrl) {
            this.initFileList(val.join(','))
          } else {
            this.initFileListArr(val);
          }
        } else {
          this.initFileList(val)
        }
      }
    }
  },
  computed: {
    isImageComp() {
      return this.fileType === FILE_TYPE_IMG
    },
    complistType() {
      return this.fileType === FILE_TYPE_IMG ? 'picture-card' : 'text'
    }
  },
  created() {
    const token = Vue.ls.get(ACCESS_TOKEN);
    //---------------------------- begin 图片左右换位置 -------------------------------------
    this.headers = { "X-Access-Token": token };
    this.containerId = 'container-ty-' + new Date().getTime();
    //---------------------------- end 图片左右换位置 -------------------------------------
  },

  methods: {
    initFileListArr(val) {
      if (!val || val.length == 0) {
        this.fileList = [];
        return;
      }
      let fileList = [];
      for (var a = 0; a < val.length; a++) {
        let url = getFileAccessHttpUrl(val[a].filePath);
        fileList.push({
          uid: uidGenerator(),
          name: val[a].fileName,
          status: 'done',
          url: url,
          response: {
            status: "history",
            message: val[a].filePath
          }
        })
      }
      this.fileList = fileList
    },
    initFileList(paths) {
      if (!paths || paths.length == 0) {
        //return [];
        // update-begin- --- author:os_chengtgen ------ date:20190729 ---- for:issues:326,Jupload组件初始化bug
        this.fileList = [];
        return;
        // update-end- --- author:os_chengtgen ------ date:20190729 ---- for:issues:326,Jupload组件初始化bug
      }
      let fileList = [];
      let arr = paths.split(",")
      for (var a = 0; a < arr.length; a++) {
        let url = getFileAccessHttpUrl(arr[a]);
        fileList.push({
          uid: uidGenerator(),
          name: getFileName(arr[a]),
          status: 'done',
          url: url,
          response: {
            status: "history",
            message: arr[a]
          }
        })
      }
      this.fileList = fileList
    },
    handlePathChange() {
      let uploadFiles = this.fileList
      let path = ''
      if (!uploadFiles || uploadFiles.length == 0) {
        path = ''
      }
      let arr = [];

      for (var a = 0; a < uploadFiles.length; a++) {
        arr.push(uploadFiles[a].response.message)
      }
      if (arr.length > 0) {
        path = arr.join(",")
      }
      this.$emit('change', path);
    },
    beforeUpload(file) {
      this.uploadGoOn = true
      var fileType = file.type;
      if (this.fileType === FILE_TYPE_IMG) {
        if (fileType.indexOf('image') < 0) {
          this.$message.warning('请上传图片');
          this.uploadGoOn = false
          return false;
        }
      }
      //TODO 扩展功能验证文件大小
      return true
    },
    handleChange(info) {
      console.log("--文件列表改变--")
      if (!info.file.status && this.uploadGoOn === false) {
        info.fileList.pop();
      }
      let fileList = info.fileList
      if (info.file.status === 'done') {
        if (this.number > 0) {
          fileList = fileList.slice(-this.number);
        }
        if (info.file.response.success) {
          fileList = fileList.map((file) => {
            if (file.response) {
              let reUrl = file.response.message;
              file.url = getFileAccessHttpUrl(reUrl);
            }
            return file;
          });
        }
        //this.$message.success(`${info.file.name} 上传成功!`);
      } else if (info.file.status === 'error') {
        this.$message.error(`${info.file.name} 上传失败.`);
      } else if (info.file.status === 'removed') {
        this.handleDelete(info.file)
      }
      this.fileList = fileList
      if (info.file.status === 'done' || info.file.status === 'removed') {
        //returnUrl为true时仅返回文件路径
        if (this.returnUrl) {
          this.handlePathChange()
        } else {
          //returnUrl为false时返回文件名称、文件路径及文件大小
          this.newFileList = [];
          for (var a = 0; a < fileList.length; a++) {
            var fileJson = {
              fileName: fileList[a].name,
              filePath: fileList[a].response.message,
              fileSize: fileList[a].size
            };
            this.newFileList.push(fileJson);
          }
          this.$emit('change', this.newFileList);
        }
      }
    },
    handleDelete(file) {
      //如有需要新增 删除逻辑
      console.log(file)
    },
    handlePreview(file) {
      if (this.fileType === FILE_TYPE_IMG) {
        this.previewImage = file.url || file.thumbUrl;
        this.previewVisible = true;
      } else {
        location.href = file.url
      }
    },
    handleCancel() {
      this.previewVisible = false;
    },
    //---------------------------- begin 图片左右换位置 -------------------------------------
    moveLast() {
      //console.log(ev)
      //console.log(this.fileList)
      //console.log(this.currentImg)
      let index = this.getIndexByUrl();
      if (index == 0) {
        this.$message.warn('未知的操作')
      } else {
        let curr = this.fileList[index].url;
        let last = this.fileList[index - 1].url;
        let arr = []
        for (let i = 0; i < this.fileList.length; i++) {
          if (i == index - 1) {
            arr.push(curr)
          } else if (i == index) {
            arr.push(last)
          } else {
            arr.push(this.fileList[i].url)
          }
        }
        this.currentImg = last
        this.$emit('change', arr.join(','))
      }
    },
    moveNext() {
      let index = this.getIndexByUrl();
      if (index == this.fileList.length - 1) {
        this.$message.warn('已到最后~')
      } else {
        let curr = this.fileList[index].url;
        let next = this.fileList[index + 1].url;
        let arr = []
        for (let i = 0; i < this.fileList.length; i++) {
          if (i == index + 1) {
            arr.push(curr)
          } else if (i == index) {
            arr.push(next)
          } else {
            arr.push(this.fileList[i].url)
          }
        }
        this.currentImg = next
        this.$emit('change', arr.join(','))
      }
    },
    getIndexByUrl() {
      for (let i = 0; i < this.fileList.length; i++) {
        if (this.fileList[i].url === this.currentImg || encodeURI(this.fileList[i].url) === this.currentImg) {
          return i;
        }
      }
      return -1;
    }
  },
  mounted() {
    const moverObj = document.getElementById(this.containerId + '-mover');
    moverObj.addEventListener('mouseover', () => {
      this.moverHold = true
      this.moveDisplay = 'block';
    });
    moverObj.addEventListener('mouseout', () => {
      this.moverHold = false
      this.moveDisplay = 'none';
    });
    let picList = document.getElementById(this.containerId) ? document.getElementById(this.containerId).getElementsByClassName('ant-upload-list-picture-card') : [];
    if (picList && picList.length > 0) {
      picList[0].addEventListener('mouseover', (ev) => {
        ev = ev || window.event;
        let target = ev.target || ev.srcElement;
        if (target.className == 'ant-upload-list-item-info') {
          this.showMoverTask = false
          let item = target.parentElement
          this.left = item.offsetLeft
          this.top = item.offsetTop + item.offsetHeight - 50;
          this.moveDisplay = 'block';
          this.currentImg = target.getElementsByTagName('img')[0].src
        }
      });

      picList[0].addEventListener('mouseout', (ev) => {
        ev = ev || window.event;
        let target = ev.target || ev.srcElement;
        //console.log('移除',target)
        if (target.className == 'ant-upload-list-item-info') {
          this.showMoverTask = true
          setTimeout(() => {
            if (this.moverHold === false) { this.moveDisplay = 'none'; }
          }, 100)
        }
        if (target.className == 'ant-upload-list-item ant-upload-list-item-done' || target.className == 'ant-upload-list ant-upload-list-picture-card') {
          this.moveDisplay = 'none';
        }
      })
      //---------------------------- end 图片左右换位置 -------------------------------------
    }
  },
  model: {
    prop: 'value',
    event: 'change'
  }
}
</script>

<style lang="less">
    .uploadty-disabled{
        .ant-upload-list-item {
            .anticon-close{
                display: none;
            }
            .anticon-delete{
                display: none;
            }
        }
    }
    //---------------------------- begin 图片左右换位置 -------------------------------------
    .uploadty-mover-mask{
        background-color: rgba(0, 0, 0, 0.5);
        opacity: .8;
        color: #fff;
        height: 28px;
        line-height: 28px;
    }
    //---------------------------- end 图片左右换位置 -------------------------------------
</style>
